From this PERT$/$CPM network, answer the following questions. Note that the expected value in the arrows by weeks. $[1\mathrm{.}5$ Mark each$]$

Q$6.$ If variance for this project $4,$ what prob. To finish project within $32$ weeks

a$.0\mathrm{.}494$

b$.0\mathrm{.}472$

c$.0\mathrm{.}994$

d$.0\mathrm{.}949$

e$.$ none of them